Right well on the first mission you do with the harkback frame, the one in which you have to capture three howitzers and a lab, whenever i actually achieve the objectives instead of declaring the objectives are complete it tells me i have failed then the mission ends.... : /
I have checked and double checked the objectives and i deffinitely have to capture them and that is what i have done a few times over... its starting to get annoying. has anyone else had this problem? anyway of getting round it?

I failed this mission once too. But it was because I seriously messed up the other frame / literally destroyed the enemy. Then I went to proudly claim the howitzers and the missuin failed...
Now I just activate the individual shield around each howitzer.

since the enemy is so keen on destroying my howitzers, i just build my generators around them without capturing them.
at the same time i prevent the enemy from spreading with a rocket squad in its path along the howitzers.

fortunately i dont have the bug mentioned here, but there is one thing missing from the mission objectives: the enemy frame must survive! for me the mission fails once i destroy it. weird.

Thats it, you dont want to destroy it!